Added WGLTS level for Science

Merged Zhou Fang requested to merge zhoufang/membership.eclipse.org:zhoufang/dev/updateWG into dev

For science.eclipse.org!29 (merged)

The API https://membership.eclipse.org/api/organizations?pagesize=100&working_group=science has WGLTS level but there is no such level in working_groups.json.

But in /organizations API, the description for WGLTS is null. (which should be Steering Committee, referred from prod site)

Edited by Zhou Fang

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